Sending, receiving, and organizing email in Outlook.com
I agree but there have been many cases where users spam volume goes down suddenly. One of my users became a spam/phishing victim about a month ago. More than 1500 junk mail hammered his mailbox in 7 hours. They came from more than 600 unique IP addresses that belong to Microsoft. Suddenly it stopped completely. I did nothing except contacting support. They must have caught the spammers who abused their system. I'm a 365 subscriber.